5%含硼聚乙烯10含硼聚乙烯20含硼聚乙烯30含硼聚乙烯板

含硼聚乙烯，含硼聚乙烯板，鉛硼聚乙烯板，防輻射含硼板，防輻射屏蔽板，中子加速屏蔽板

含硼聚乙烯是指加硼處理的聚乙烯。純聚乙烯是硬質(zhì)、半透明白色蠟狀物質(zhì)，軟化溫度115°C，易加工成所需形狀。密0.92g/cm3，單位體積含氫原子數(shù)7.8～8.0×1022個/cm3，含氫量比水多，慢化中子能力比水強(qiáng)，是極有效的中子屏蔽材料。為降低聚乙烯中碳和氫俘獲熱中子后放出二次γ輻射的強(qiáng)度，需加硼處理。通常加入325目的硼酐(B2O3)粉末，但因其有吸水性，制片時能形成泡沫狀蒸氣，現(xiàn)已用碳化硼(B4C)代替。含8%(重量)天然B4C的聚乙烯可使俘獲的γ射線強(qiáng)度減少100倍。含硼聚乙烯需著色，以區(qū)別未含硼聚乙烯。因其軟化溫度低，不宜在反應(yīng)堆受熱部位作中子屏蔽材料用。

含硼聚乙烯，射線防護(hù)板防輻射超高分子量聚乙烯含硼板性能：對x、y輻射線、同位素實(shí)驗(yàn)室等墻面抹灰對（散射線、漏射線、反彈射線）具有很強(qiáng)的吸收合衰減的作用，價格低廉，使用方便。普遍用于輻射場所的墻面和樓地板的防護(hù)使用。安全無害，具有穩(wěn)定防護(hù)性能，堅(jiān)實(shí)可靠，不易受損破裂。很好的防潮，抗沖擊，零吸水率，性能穩(wěn)定，抗老化性好，地面、地下埋沒均可，50年不老化。按ASTM方法測定（負(fù)荷4.6㎏/cm2），熱變形溫度為85℃，使用溫度可達(dá)90℃，特殊情況下，允許在更高的溫度下使用

The results show that the shielding efficiency of the boron containing polyethylene plate is higher than that of the non boron containing polyethylene plate at the same thickness. When the thickness of boron containing polyethylene plate is more than 20cm, the shielding efficiency of the two kinds of neutron sources tends to be the same gradually, because the attenuation of neutron radiation in the material follows the exponential attenuation law. The results show that the shielding efficiency of the boron containing polyethylene sheet for 241Am be neutron source is in the range of 47.7% - 97.7% and for 252Cf neutron source is in the range of 60% - 98.2% with the thickness of 3.2-22.4cm. Generally, 5% boron containing polyethylene plate with thickness of 10-20cm is selected to shield fast neutrons, which can achieve satisfactory protection effect.